Fix multi-bill display, charge amount parsing, and charge log responses

- chargeoptions is the real field gating 2000/5000/10000 yen display
- chargeid (not chargenum) carries the actual denomination on charge
- getrecentcharge/getlastlog: fixed num mismatch, added missing result
  section, and added placeholder items for empty result sets

MedusaPluginChargeMachine/Models/Request/ChargeRequest.cs

@@ -8,6 +8,14 @@ public class ChargeRequest
     [XmlElement("chargenum")]
     public required string ChargeNumber { get; set; }
 
+    // The actual denomination, not chargenum - real traffic (spice2x
+    // "automap" capture) shows chargenum is always the quantity ("1" for a
+    // single bill), while chargeid carries the value as e.g. "N10000P"
+    // (Note/10000/Paseli). chargenum * 1000 alone reports every bill as
+    // 1000 yen regardless of what was actually inserted.
+    [XmlElement("chargeid")]
+    public required string ChargeId { get; set; }
+
     [XmlElement("sessid")]
     public required string SessionId { get; set; }
 }

MedusaPluginChargeMachine/Models/Request/GetRecentChargeRequest.cs

@@ -5,6 +5,9 @@ namespace MedusaPluginChargeMachine.Models.Request;
 [XmlRoot("eacharge")]
 public class GetRecentChargeRequest
 {
+    [XmlElement("num")]
+    public string? Num { get; set; }
+
     [XmlElement("sessid")]
     public string? SessionId { get; set; }